<template>
	<canvas v-if="canvasId" class="ec-canvas" :id="canvasId" :canvasId="canvasId" @touchstart="touchStart"
		@touchmove="touchMove" @touchend="touchEnd" @error="error">
	</canvas>
</template>

<script>
	// import * as echarts from '@/utils/echarts.min(5.2.4).js';
	import * as echarts from '@/utils/echarts.min(5.4.2).js';
	import WxCanvas from './wx-canvas';

	function wrapTouch(e) {
		for (let i = 0; i < e.mp.touches.length; i += 1) {
			const touch = e.mp.touches[i];
			touch.offsetX = touch.x;
			touch.offsetY = touch.y;
		}
		return e;
	}

	export default {
		props: {
			// echarts: {
			// 	required: true,
			// 	type: Object,
			// 	default () {
			// 		return null;
			// 	},
			// },
			onInit: {
				type: Function,
				default: null,
			},
			CNJKtime:{
				type: String,
			},
			option:{
				type: String,
			},
			canvasId: {
				type: String,
				default: 'ec-canvas',
			},
			lazyLoad: {
				type: Boolean,
				default: false,
			},
			disableTouch: {
				type: Boolean,
				default: false,
			},
			throttleTouch: {
				type: Boolean,
				default: false,
			},
		},
		onReady() {
			// if (!this.echarts) {
			// 	console.warn('组件需绑定 echarts 变量，例：<ec-canvas id="mychart-dom-bar" ' +
			// 		'canvas-id="mychart-bar" :echarts="echarts"></ec-canvas>');
			// 	return;
			// }

			if (!this.lazyLoad) this.init();
		},
		methods: {
			init(callback) {
				const version = wx.version.version.split('.').map(n => parseInt(n, 10));
				const isValid = version[0] > 1 || (version[0] === 1 && version[1] > 9) ||
					(version[0] === 1 && version[1] === 9 && version[2] >= 91);
				if (!isValid) {
					console.error('微信基础库版本过低，需大于等于 1.9.91。' +
						'参见：https://github.com/ecomfe/echarts-for-weixin' +
						'#%E5%BE%AE%E4%BF%A1%E7%89%88%E6%9C%AC%E8%A6%81%E6%B1%82');
					return;
				}

				const canvasId = this.canvasId; //------***修改***------
				this.ctx = wx.createCanvasContext(canvasId, this); //------***修改***------

				const canvas = new WxCanvas(this.ctx, canvasId);

				echarts.setCanvasCreator(() => canvas);

				const query = wx.createSelectorQuery().in(this); //------***修改***------
				query.select(`#${canvasId}`).boundingClientRect((res) => {
					if (!res) {
						setTimeout(() => this.init(), 50);
						return;
					}

					const {
						width,
						height
					} = res;

					if (typeof callback === 'function') {
						this.chart = callback(canvas, width, height);
					} else if (typeof this.onInit === 'function') {
						// console.log(this.option);
						this.chart = this.onInit(canvas, width, height,this.option);
					}

					if (!this.chart) {
			 		return;
					}

					const {
						handler
					} = this.chart.getZr();

					this.handler = handler;
					this.processGesture = handler.proxy.processGesture || (() => {});
				}).exec();
			},
			canvasToTempFilePath(opt) {
				const {
					canvasId
				} = this;
				this.ctx.draw(true, () => {
					wx.canvasToTempFilePath({
						canvasId,
						...opt,
					});
				});
			},
			touchStart(e) {
				const {
					disableTouch,
					chart
				} = this;
				if (disableTouch || !chart || !e.mp.touches.length) return;
				const touch = e.mp.touches[0];
				this.handler.dispatch('mousedown', {
					zrX: touch.x,
					zrY: touch.y,
				});
				this.handler.dispatch('mousemove', {
					zrX: touch.x,
					zrY: touch.y,
				});
				this.processGesture(wrapTouch(e), 'start');
			},
			touchMove(e) {
				const {
					disableTouch,
					throttleTouch,
					chart,
					lastMoveTime,
				} = this;
				if (disableTouch || !chart || !e.mp.touches.length) return;

				if (throttleTouch) {
					const currMoveTime = Date.now();
					if (currMoveTime - lastMoveTime < 240) return;
					this.lastMoveTime = currMoveTime;
				}

				const touch = e.mp.touches[0];
				this.handler.dispatch('mousemove', {
					zrX: touch.x,
					zrY: touch.y,
				});
				this.processGesture(wrapTouch(e), 'change');
			},
			touchEnd(e) {
				const {
					disableTouch,
					chart
				} = this;
				if (disableTouch || !chart) return;
				const touch = e.mp.changedTouches ? e.mp.changedTouches[0] : {};
				this.handler.dispatch('mouseup', {
					zrX: touch.x,
					zrY: touch.y,
				});
				this.handler.dispatch('click', {
					zrX: touch.x,
					zrY: touch.y,
				});
				this.processGesture(wrapTouch(e), 'end');
			},
		},
	};
</script>

<style scoped>
	.ec-canvas {
		width: 100%;
		height: 100%;
	}
</style>

